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263 

Federal Aviation Administration, DOT 

Pt. 121, App. C 

Distance in feet 

Standard altitude in feet 

Airplane weight in pounds and approach speeds

1

in knots 

40,000 

V

50

 

42,000 

V

50

 

44,000 

V

50

 

45,000 

V

50

 

8,000 .....................................................................................

4,550  86 4,750  88 4,970  90 5,060  91 

1

Steady approach speed through 50 foot-height-knots TIAS denoted by symbol 

V

50

Ref. Fig. 3(b)(1). 

(2) Curtiss model C–46 certificated for maximum weight of 48,000 pounds.

1

(0.70 factor.) 

Distance in feet 

Standard altitude in feet 

Airplane weight in pounds and approach speeds

2

in knots 

42,000 

V

50

 

44,000 

V

50

 

46,000 

V

50

 

48,000 

V

50

 

S.L .........................................................................................

2,890 80 3,000 82 3,110 84 3,220 86 

1,000 .....................................................................................

2,960  80 3,070  82 3,180  84 3,280  86 

2,000 .....................................................................................

3,040  80 3,150  82 3,260  84 3,360  86 

3,000 .....................................................................................

3,110  80 3,220  82 3,340  84 3,440  86 

4,000 .....................................................................................

3,180  80 3,300  82 3,410  84 3,520  86 

5,000 .....................................................................................

3,260  80 3,380  82 3,500  84 3,610  86 

6,000 .....................................................................................

3,330  80 3,460  82 3,580  84 3,700  86 

7,000 .....................................................................................

3,420  80 3,540  82 3,670  84 3,800  86 

8,000 .....................................................................................

3,500  80 3,630  82 3,760  84 3,900  86 

1

For use with Curtiss model C–46 airplanes when approved for this weight. 

2

Steady approach speed through 50 foot-height-knots TIAS denoted by symbol 

V

50

Ref. Fig. 3(b)(2). 

(c) Actual length of runway required when effective length, considering obstacles, is not de-

termined in accordance with § 121.171. 

(1) Curtiss model C–46 certificated for maximum weight of 45,000 pounds.

(0.55 factor.) 

Distance in feet 

Standard altitude in feet 

Airplane weight in pounds and approach speeds

1

in knots 

40,000 

V

50

 

42,000 

V

50

 

44,000 

V

50

 

45,000 

V

50

 

S.L .........................................................................................

4,710 86 4,910 88 5,130 90 5,230 91 

1,000 .....................................................................................

4,840  86 5,050  88 5,270  90 5,370  91 

2,000 .....................................................................................

4,960  86 5,180  88 5,410  90 5,510  91 

3,000 .....................................................................................

5,090  86 5,320  88 5,550  90 5,660  91 

4,000 .....................................................................................

5,230  86 5,460  88 5,700  90 5,810  91 

5,000 .....................................................................................

5,360  86 5,600  88 5,850  90 5,960  91 

6,000 .....................................................................................

5,500  86 5,740  88 6,000  90 6,110  91 

7,000 .....................................................................................

5,640  86 5,900  88 6,170  90 6,280  91 

8,000 .....................................................................................

5,790  86 6,050  88 6,340  90 6,450  91 

1

Steady approach speed through 50 foot-height-knots TIAS denoted by symbol 

V

50

Ref. Fig. 3(c)(1). 

(2) Curtiss C–46 certificated for maximum weight of 48,000 pounds.

1

(0.55 factor.) 

Distance in feet 

Standard altitude in feet 

Airplane weight in pounds and approach speeds

2

in knots 

42,000 

V

50

 

44,000 

V

50

 

46,000 

V

50

 

48,000 

V

50

 

S.L .........................................................................................

3,680 80 3,820 82 3,960 84 4,090 86 

1,000 .....................................................................................

3,770  80 3,910  82 4,050  84 4,180  86 

2,000 .....................................................................................

3,860  80 4,000  82 4,140  84 4,280  86 

3,000 .....................................................................................

3,960  80 4,090  82 4,240  84 4,380  86 

4,000 .....................................................................................

4,050  80 4,190  82 4,340  84 4,490  86 

5,000 .....................................................................................

4,150  80 4,290  82 4,450  84 4,600  86 

6,000 .....................................................................................

4,240  80 4,400  82 4,560  84 4,710  86 

7,000 .....................................................................................

4,350  80 4,510  82 4,670  84 4,840  86 

8,000 .....................................................................................

4,450  80 4,620  82 4,790  84 4,960  86 

1

For use with Curtiss model C–46 airplanes when approved for this weight. 

2

Steady approach speed through 50 foot-height-knots TIAS denoted by symbol 

V

50

Ref. Fig. 3(c)(2). 

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